Moulding machine for the jolting, squeezing or simultaneous jolting and squeezing of moulds



June 30, 1959 BUHRER 2,892,223

MOULD "G CHINE FOR THE. JOLTING, SQUEEZING OR SIMU N S JOLTING AND SQUEEZING OF MOULDS 1 Filed April 16, 1954 5 Sheets-Sheet 1 5 Sheets-Sheet 2 1.7 rlrllrlldvmw m E g-girl}? w uz III EN lI/l/l/l/Il/l/l/ E. BUHRER MOULDING MACHINE FOR THEJOLTING, SQUE'EZING OR SIMULTANEOUS JOLTING AND SQUEEZING OF MOULDS June 30, 1959 Filed April 16, 1954 nevi 7';

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June 30, 1959 U 2,892,223

MOULDING MACHINE FOR THE. JOLTING, SQUEEZING OR I I SIMULTANEOUS JOLTING AND SQUEEZING OF MOULDS Filed April 16, 1954 3 Sheets-Sheet 3 [aw/way? 49f United S ttes Patent O MOULDING MACHINE FOR THE JOLTING, SQUEEZING OR SIMULTANEOUS JOLTING AND SQUEEZING OF MOULDS Erwin Biihrer, Schafihausen, Switzerland Application April 16, 1954, Serial No. 423,786 Claims priority, application Switzerland August s, 1953 Claims. (31. 22-43) V The present invention relates to a moulding machine in which jolting, squeezing or simultaneous jolting and squeezing are utilized for compacting moulds or for finally compacting precompacted moulds.

The compacting of granular masses has hitherto been achieved by squeezing, by jolting and subsequently squeezing, or by simultaneously applying the two eflects.

In the squeezing process, an external squeezing pressure is exerted by means of a press plate on the granular mass which however, owing to friction, is more tightly compacted in the portion adjacent to the press plate than in the more distant portion adjacent to the pattern equipment plate plane. In the jolting process, the speed developed by the granular mass, for instance in free fall is suddenly checked. It is known that due to the inertia of the falling granular mass itself, in contrast to the effects of the squeezing process, said mass attains the highest degree of density in the pattern equipment plate plane.

An additional squeezing effect is obtained by placing a weighting plate on the granular mass during the jolting process. But this additional effect is not in itself suflicient to achieve perfect compaction. A swivelling press fitted on the mould table and acting on the granular mass during the jolting process by means of a press plate designed as a weighting plate failed to give good results in practice because the equipment proved too clumsy and insufiiciently accessible.

A number of different suggestions recommend the fitting of hammers or jolting pistons either on the press plate side or on the pattern equipent or mould table side. All these suggestions, which provide for simultaneously squeezing and working the jolting pistons or hammers while the granular mass remains stationary, are erroneously termed jolting presses. In order to distinguish clearly their mode of operation from the simultaneous inertia jolting and squeezing described below, this group of suggestions, in which the granular mass undergoes no modification of its state of movement during the squeezing and working of the hammers or jolting pistons, should be termed squeezing with simultaneous hammering since the blows dealt merely achieve an intermittent increase in the squeezing pressure. In contrast thereto the suggestions in which the granular mass, while subjected to a squeezing pressure, is simultaneously compelled suddenly to modify its state of movement so that the inertia of the granular mass itself is made use of, are termed squeezing with simultaneous inertia jolting or jarsqueezing. Whereas squeezing with simultaneous hammering does not affect inequalities of compaction any more due to friction than squeezing alone, the process of inertia jolting and simultaneous squeezing is able to smooth them out because with inertia jolting the points of maximum compaction are located in an opposite position to those produced by squeezing alone.

In the present invention the press is only linked with the mould table, or with parts attached thereto, during the process of squeezing or simultaneous jolting and squeezing, but otherwise has no material contact with it.

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The drawings illustrate three embodiments of the object of the invention by way of example, as follows:

Fig. l is a side view of a moulding machine drawn partly in section;

Fig. 2 is a top view of Fig. 1;

Fig. 3 shows a second embodiment of part of a moulding machine drawn partly in section;

Fig. 4 is a sectional view taken along the line IVIV in Fig. 3; and

Fig. 5 shows a third embodiment of part of a moulding machine drawn partly in section.

Referring now to Figs. 1 and 2, there is shown an arrangement in which the jolting equipment R is stationary and the press P can swivel. On the stand or column 1 the swivelling sleeve 2 is supported. The latter has six lugs 3 (Fig. 2) in each pair of which, rods 4 are fixed. On the press P are provided three coupling members in the shape of the arms 6 and 6a, of which the arm 6a has three guide lugs 7 which are supported or guided for upward and downward movement on the rods 4 and rest against the lugs 3 forming seat means when the press is in the position of rest. The press P can swivel round the column 1 by means of the sleeve 2. The mould table 8 of the jolting equipment R carries a pattern equipment 9 on which rests the moulding box 10 filled with a granular mass 11. The mould table 8 rests on buffer bolts 12 which are supported by screws 13 in the foot of the jolting equipment R. The air duct 15 termi nates in the cylinder 14a of the foot 14 of the jolting equipment R. The arms 6 and 6a of the press P have claws 64 which engage under the mould table 8 so that when the ram 62 presses against the granular mass the press is coupled to the mould table and the coupling members take up the squeezing pressure. In order to produce the inertia jolting effect the mould table 8 can then move up and down independently of the simultaneously applied squeezing pressure. Consequently three forces act simultaneously in the process of squeezing with simultaneous inertia jolting:

( l) Squeezing of the granular mass by the press.

. (2) Due to the sudden variation of the state of movement and the inertia of the granular mass, jolting causes a force within the latter.

(3) Due to the sudden termination of the state of movement and the inertia of the press ram, jolting causes a force within the latter which acts on the granular mass as an additional squeezing.

Fig. 3 shows equipment for this purpose, combined,

by way of example, with a machine having an interwhen the jolting process is applied and is only coupled to the mould table. The stationary non-pivoting column 16 has lugs 17 which carry conical pivot bolts 18. In

order to prevent the guiding eyes from impinging violently on the conical pivot bolts 18, a buffer device is provided which can be seen in Fig. 4. In the lugs 51 is disposed a conical bushing 48 which can slide andwhich rests against the cup springs 49. The conical bushing and the p-restressed cup springs 4-9 are maintained in the lugs 51 by the screws 50. On to the column 16 is connected a guide ring 19 on which rests a spring 20 designed to take up at least part of the weight of the press P. This spring transmits its compression to a ring 21 fixed to the member 22 which is in turn fixed to the sleeve 23 and which is fixed to the member 24. To the member 24 are attached the hook-shaped arms 25 and 25a of which the arm 25 has lugs 51. The lugs 51 in Fig. 3 replace the lugs 7 in Figs. 1 and 2 and the pivot bolts 18 replace the rods 4 employed there. In the threaded bushing 26, which can turn in the member 22, a threaded,

bolt'27 "holds the cylinder 28 of the press P, which cylinder is at the same time slide-fitted in the member 24' and prevented from rotating. To the threaded bushing '26 'is attached a sleeve '29 which has handles" '30fa'ndf by its rotation enables the"press cyIin'd'elfZS "t'o' be vsiii'any; air duct 31 leads'to press cylinder 28 wherein a piston 32 with a screw 33 is supportedofl a piston rod 34 to which is attached a "press plate 35'. A 'pistor'i spfihg" 36"rests against a lid 37' of the cylinder 28 and supports the' pi'ston' inure position arrest; on a slid'evvay "38,"cente'r'ed by' the"'bo'=lt '39,rests a revolving table 40 fitted with several cylinders 41, designed for 'ih s'taiice" for 'shock'le's's joltinfg, in each of whi'ch 'is a counter jolting pistOn lLwHose'mould table Misguided by the'jolting piston 63in the' 'counter"joltirig"piston 42 and on "bu'tferbolts' 4-3 arr ngea'is the "counter jolting pis'ton '42: On the inould table {14 the'reisi'a assis- 'iag orpsuetsasvice 45 with theinoulding box 46 -fille'd with a granularmass47.

rsssqsisrsesr'inusrratsd in Fig. differs from that of Fig 3 "intha't.the press P can also swivel, as in FigLl. The'holding deviceSZ for the press 53 is rotatable'and supported on the stand'54 so that it can beturned' by steamer the'cogs' 55,56 and 57. Thecog 57 is on the rotary table 58 which carries several jolting devices R.

The moulding machine illustrated in "Figs'l and 2 operates as follows:

when thepress Plies in its swivelled 'out position 60 (Fig. 2) the'mou'lding box 10 is set on the jolting pr ess -R"andthegranu1ar mass 11 is poured in. After pr ecompressing-by the jolt'ing process or even immediately after thamsslaisg' box 10 has been filled, the press P is s 'wivelle'ddri to the position shownin Figs. -1 and 2. Thepress P 'is' subjected 'to squee'ziiig pressure through theair duct 61 anda valve not shown in' the drawing. The squeezin -platen presses aga'ihst magmas-1n insss 11'and thus raises the press P so that the claws 64 of theai'mG, which'ser've as"couplingfcoiiie to rest on the ui'lderside of the mould tab'le's. Simiiltaneously tlie guide lugs 7 arelift'ed off the lugs 3 on whieh they rest in-the position of rest (Fig. 1).

By aettiating a valve not shown iri'the drawing compressed is fed to th'hifdtiiit 1 5: The nibhld table '8is' 'ra'is'edltogether 'with thepress P aiid'jarredin the known way, while the ram 62 "of the press" P- squeezes simultaheolisly a'g'aitis t the granular mass;- the counterpresssrabem taking-up by the antes add 6Z1; Upon estuaries of suitable valves'afte'nthe completion of the compaction process, the pressure tfloiivoiit'of the diititsls and 61. The mould table remains supported on the buffer bolts 12,whereasthe squeezing plate 62, whichj is subject to aspring pressure acting vertically upwards; moves relatively to the press P'so that the latter falls until the guide lugs 7 rest on'the lugs 3. Theclaws ave simultaneously dropped from the underside of thernould table 8. The press P isn'ow' swivelled out in the direction of rthe ai' row 60 (Fig. 2), the finished niouldisraised in'a known way not shown in the drawin'gg a newmsuldisg boxis set in place and the process is repeated. Depending on the type'of mould the granula'r inass can be compacted byjar squeezing in 'asing le operation without pre-compaction.

The equi ment illustrated in Fig 3 operates in the same way as "that of Fig. 1, the only 'difierence being thatthe pressfdoes not swivel because the joltin g'equip n ent R revolves round'an axis. In the machine illustrated in Fig. 5 both the jolting equipment and the press? swivelf'round a'vertical axis. In'the equipment illustrated in Figs. 3 and 5 part of the weight of the press P is ltalcen up bythe springs 36 so that the counter'jolo ingzpist'on 43, 'which'is dimensioned for jolting without the press I, can lift thelweight to which it is subject. equipment as illustrated in Figs. 3 and 5 is designed for'slidcklessjolting.

Experiments have shown that the invention operates to greater advantage the higher is the mould to be prepared and/or the pattern equipment to be copied. The principle can be applied to all moulding machines fitted with a jolting equipment.

What I claim is:

1; In a moulding machine for compacting granular materialcontaine'cl in a mould box} a mould table arranged to support said'boi'r with said granular material, means arranged below said mould table and operatively connected thereto for joltiilgsaid material and thereby precompacting the same, squeezing means" adapted 'to assume an upper and a lower location and situated above said rnould table, said squeezin'g'rrieans including a cylinder and a ram movable within said-cylinder and engageable with said material for final compaction of said material in said box, support means out of contact with said joltingmearis andsaid mouldtabl'e' and 'suspnding'said 'sq'ueeiing means, said squeeziiig means being adapted to perform upward anddownw'ard 'hiovenieritrelativ'e to said support means? said support means including further means to firmly seat "saidv s ueezin means in said lower location'of'thelatter,'fliiid supply means connected'to'said cylinder for movin said ram into and out'of engagement, "respectively, with said "material in *said has, spring-bperate'd coupling means rigidly connected to andfdep'e'nding from said cylinder and terminatiiigiri'hook-shaped arms,

' andspring'means interposed between'said 'suppsr'rm'eans 'aiid saidsqueezing means, said hook-'shapdarnis ex tend ing'benea'th said'mould'table and being engag'eable with the latter 'on' lyf'upon engagement offsaid ram with said material insaid 'mould box with 's'aid'spring ineans urging said "cou ufi jme'ans' includiii g' said "arms "to' eifeet rigid intefeontiection 'of said squeezing meanswithsaid mould table in' said upper locatioii," said interconnection being elfef solely durii1g'finalf compactihh ofs'a'id'mat'erial whereby simultafiesus iol tirig arid'squ'eezirig actions'occ'ur', said arms *bihg dis'erigag'eaale fro ir'i' said' 'Irio'iild table for cdlfipltr separating said squeezing means from said mould table, to thereby facilitate seatin of saidsqu'ee'zin means on said further tn'esnsin'said low'e'r'lo'cation and to make available said squeeziiig' means and said mould table 'for respeetive'indepeiideiitopeiations.

I 2. In a moulding machine for compacting granular matei'ia'l contained in aniou'ld 'boxja 'iiiould table arranged to support said bok with said granular material, means arranged below said 'mouldtable aiid operatively 'con n ted thereto for jolting said 'r'naterial and thereby precon'ipa'cti'ng the same, squeezing means adapted to assume an' upper and a lower 'locatioii and situated above said rhould table, said 's ue'ez'ing'rhe'ahs including a cylinder aiidi'a ra'rii'ni'ovable within said c 'lisas'r an'dehga'geablc with' s aid' material for final competition of 'said material in said box, support means out of Contact with said jolting m n and said mould'table and suspending said squeezing means, said squeezing means being adapted to perform ssward'aaadowawsrd msv'mnr raarive to said support means, said support nieahs including further means to analysts; saidsq'ue'ziiig means 'insaid lower location of thelatterpfluid supply means connected to said cylindef tor movi'ri'g said ram into and out of engagementQrespecti vely with said material in said boir, coupling means rigidly co nii'eeted to and depending from said cylinder and terminating in hook-shaped arms, said hook shaped ar'ins entenduigbeneath-said mouldtable and being engageablejwith the latter only upon engagementgof said ram" said-material in said mould box to effect rigid interconnectioii of said squeezing means with said mould said up'per location, said interconnection being effected solely during final compaction of said material wherebysimultaneous jolting and-squeezing actions occur, s aid arms beingdisengageable from said mould table for completely separating said squeezing means from said mould table, to thereby facilitate seating'of-said squeezing means on said further means in said lower location and to make available said squeezing means and said mould table for respective independent operations.

3. A moulding machine for compacting granular material contained in a mould box; comprising a mould table arranged to support said box with said granular material, means arranged below said mould table and operatively connected thereto for jolting said material and thereby precompacting the same, squeezing means including a cylinder and a ram movable within said cylinder and operable to finally compact said material in said box, support means out of contact with said jolting means and said mould table and suspending said squeezing means for swivelling movement thereof between a first position relatively remote from said mould table and a second position above said mould table, said support means permitting upward and downward movements of said squeezing means, said support means including further means to firmly seat said squeezing means in a lower location of the squeezing means, fluid supply means connected to said cylinder for moving said ram into and out of engagement, respectively, with said material in said box from above, coupling means rigidly connected to and dependent from said cylinder, said coupling means including hook-shaped arms extending beneath and being engageable with said mould table only upon engagement of said ram with said material when placed in said box to efiiect rigid interconnection of said squeezing means with said mould table solely during final compaction of said material in which simultaneous jolting and squeezing thereof occur, said coupling means being disengageable from said mould table in order to completely separate said squeezing means from said mould table to seat said squeezing on said further means in said lower location and to thereby permit swivelling movement of said squeezing means into said first position.

4. A moulding machine for compacting granular material contained in a mould box; comprising a mould table arranged to support said box with said granular material, means arranged below said mould table and operatively connected thereto for jolting said material and thereby precompacting the same, squeezing means including a cylinder and a ram movable within said cylinder and operable to finally compact said material in said box, support means out of contact With said jolting means and said mould table and suspending said squeezing means for swivelling movement thereof between a first position relatively remote from said mould table and a second position above said mould table, said support means permitting upward and downward movements of said squeezing means, operable means interposed between said support means and said squeezing means, said support means including further means to firmly seat said squeezing means in a lower location of the squeezing means, fluid supply means connected to said cylinder for moving said ram into and out of engagement, respectively, with said material in said box from above, coupling means rigidly connected to and dependent from said cylinder, said coupling means including hook-shaped arms extending beneath and being engageable with said mould table only upon engagement of said ram with said material when placed in said box to efiect rigid interconnection of said squeezing means with said mould table solely during final compaction of said material in which simultaneous jolting and squeezing thereof occur, said coupling means being disengageable from said mould table in order to completely separate said squeezing means from said mould table to seat said squeezing means on said further means in said lower location and to thereby permit swivelling movement of said squeezing means into said first postion, a guide ring extending from said support means to said cylinder, said operable means including a spring seated on said guide ring, said cylinder extending through said guide ring and said spring and having an annular flange forming the upper end of said cylinder, said spring abutting against said annular flange to transmit at least part of the dead weight of said squeeze means to said support means.

5. A machine according to claim 3, further including guide rods mounted on said support means, and slide means connected to said squeezing means and arranged for upward and downward movement along said guide rods together with said squeezing means between said upper and said lower location of the latter.

References Cited in the file of this patent UNITED STATES PATENTS 569,743 Bryant Oct. 20, 1896 815,577 Bonvillain Mar. 20, 1906 857,997 Hall June 25, 1907 1,134,396 McCarte Apr. 6, 1915 1,207,361 Battenfeld Dec. 5, 1916 1,756,776 Wood Apr. 29, 1930 1,782,762 Morris et al. Nov. 28, 1930 1,932,803 Radigan Oct. 31, 1933 1,994,161 Zeman Mar. 12, 1935 2,047,209 Lawlor July 14, 1936 2,624,084 Row Jan. 6, 1953 FOREIGN PATENTS 350,020 Great Britain June 8, 1931 531,024 Germany Aug. 6, 1931 571,188 Great Britain Aug. 10, 1945 

